Question

what is the theorem for If two congruent angles form a linear pair, they are right angles.

Answer 1

congruent complements theorem

Answer 2

@amelia_bedelia

There is not another theorem for that.

In fact, the theorem would be exactly what you have posted and would have to be proved.

If two congruent angles form a linear pair, they are right angles.

It would be fairly easy to prove because if two adjacent angles have exterior sides which lie in opposite rays (form a linear pair), the angles are supplementary. So, if the two angles are supplementary and congruent, then they are right angles.

Answer 3

Right Angle Theorem